gEDA-dev: Code sprint aftermath question

[Stuart Brorson]

Guys --

Great code sprint today!  We had over 20 people on IRC (integrated
over time), and had 17 people logged in on IRC at one point in time.
I certainly had fun, and got some stuff done too (although never
enough)!   Ales told me the number of individual commits... it was
quite large.

On the way back home, I wondered if it would be possible to get an
audio link set up too.  Something like a conference call.  It would
provide a good addition to the IRC channel, and would help open up the
communication bandwidth.  (On the other hand, it might increase
useless chit-chat, but hey! this is supposed to be fun!)

Question: does anybody have a recommendation for a decent Linux-based
conference calling software system?  Requirements:

*  Free (as in beer).
*  Runs on Linux.
*  Works over the Internet (i.e. IP telephony).
*  Minimal hardware requirements.  I suppose we need to get a machine
    with a microphone and speakers, but that's all I want to get.
*  Supports conference calling (i.e. many different locations on one
    call).

Any ideas?

Cheers,

Stuart